Fatigue behavior and bilinear Coffin-Manson plots of Ni-based GH4169 alloy with different volume fractions of δ phase

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• 作者：Xian-Cheng Zhang^a ; ^{xczhang@ecust.edu.cn} ; Hai-Cong Li^a ; Xu Zeng^a ; Shan-Tung Tu^a ; ; Cheng-Cheng Zhang^b ; Qiang-Qi Wang^a
• 关键词：Low cycle fatigue ; Cyclic stress/strain curve ; Coffin-Manson plot ; δ phase ; Nickel-based alloy
• 刊名：Materials Science and Engineering: A
• 出版年：2017
• 出版时间：13 January 2017
• 年：2017
• 卷：682
• 期：Complete
• 页码：12-22
• 全文大小：3075 K
• 卷排序：682

文摘

The effect of volume fraction of δ phase, which was changed through changing the heat treatment conditions, on the strain-controlled fatigue behavior of Nickel-based GH4169 alloys at room temperature was investigated. The δ phase had almost no effect on fatigue life at strain amplitude higher than 0.5%. However, the fatigue life increased with increasing volume fraction of δ phase at the strain amplitude of 0.4%. The alloys with three different volume fractions of δ phase exhibited dual-slope Coffin-Manson relationships, which could be attributed to the changes in the deformation mode from twinning to slip bands as well as the crack initiation mode from transgranular to intergranular with increasing strain amplitude.